set default Transport target of a request

Hello guys
Im setting an automatic import scenario for our tms landscape, we have 3 different target groups, but what we trying to accomplish is to force the functional team to select manualy their target group, ive been looking around for a DEFAULT TARGET parameter or something like that.
If you want to see and understand what im trying to change, you can go to se01 and create a brand new request, select customizing or workbench and see what you get on your TARGET entry, what i would like to do is to SEND THAT LINE EMPTY so the functional team selects the one they want.
Thanks in advance for any feedback!!!
Gabriel

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